Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b18327eadb690e2bf3f07ba9c963593f7b298f4e3b691b94632ea4d04d16767' 
  AND token = 'ZMPwBZlcuuvFPno1AEXOTsScdolQjq59vFIYuH2IlQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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