Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c60209e1eda18944c6c5af91ed308b4d5ce7565c5471ba1c4f9c79527a9efcc' 
  AND token = 'Q/85+wuD5Cc7Pz2ewRE8SmyP0+GEsZfO6LKb+MhnEqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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