Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab8d987ce0386d7b3066443dc9d723c5ab7c9b0d8fe721bc4e3aec04c759b35' 
  AND token = 'b9ByNdAO+Vou36pGX7+3C/lZ7aW80urR+vdpqpOYDCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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