Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '54ee39390633dfee00baa086a5d3afecb7cc24f2d08f88da9e3e7df362394fc6' 
  AND token = 'n/+N50HX4slnTA8s3YM07JKESlLoVwREu+DyCI84KUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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