Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e57d4e7f29f024cd5d5c15d815f2411878b2f3a4670679a8d857a13b890ac24' 
  AND token = '+J3tP1IfE0iTJJ0KDC37sYwxh2pKldXESieQBAN9XpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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