Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d80481172d9d90cfad8157cd5ed3defef8500be4de53795c1a06098085d398' 
  AND token = 'le8Wl48jo5t5tFQnfL9USgkno1MCpMzeIOv0SGYp9rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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