Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48bb2cb594638c0f4aed2bbb2c3cf8e5358b6593246a7be9346ea4f472f40633' 
  AND token = 'P6QUmo449m7RvEgMm0IQt24eel+rqSMKI6tjCuvXUvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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