Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014e066d81d004dd1927ab34da7c5f86f7989cbbb60fdc3e9bd4b4d3ad50d95f' 
  AND token = 'BiG+z3+xRdmyCYcvEDkRIM8/M2MU8rySlAXuqN6R6B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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