Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcc28eb864effb73e525d5d191fe093b80c6ee33d2498743d213ea146df2702' 
  AND token = '4m5Z1WWJR64ulrC4kTJ1/8ojjAaMEHOD+unv7W1WFiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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