Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e6d2751b3f9d87362257490a5c6aed6b74c39bee974818a130c2aec07b6c9b' 
  AND token = 'O4W+Cqr+aFfFIOnx3HDrjHZsi19lEyoN8utgL71TZN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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