Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ad4c8fc61e0bc6dc9a0e68bedbfe6028693ef74171f4c30d43b8e300b45e95' 
  AND token = '/vv43w5Rd8Cm/OBXg0K9rMeNh5bM6/4uYSApWm8Qxiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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