Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd263a2eaf2f88723b4d54b3fd7d2e324f3c1b8a70b5da3e1d7291c45b94880f8' 
  AND token = 'Y3DzHKdfZhvzxFmxoblqaYdqDQHZzwGNycAoT+4d9aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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