Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76cff95d907a4e83ec15f80597868495cc076a5b88abbcc68108fad994146c6c' 
  AND token = '3G6yDh9ruaYD3fjdCJ3qUI9akamzHkcQ3Max/QTDBeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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