Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6fd98d862fabaa4bdb6cbec2d76792b18a4c6114a71f5555cc89a4f3b076d10' 
  AND token = 'paOR01XiNDfYewzEp2c590IHN8wvLdPu0Bxh8/mriYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}