Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cd646dbf4c9d1e50fa9ccf0fd53a844ec2f9c4da16b676e490c65df4d078f8f0' 
  AND token = 'e+amMoPylAxWA+OshyjSyUO8kLPEyDkDsnzxd2fsOJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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