Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33afe71d642d9e82bb308b0526d6199211ca7bde3535009c992a21ec4fe14dd' 
  AND token = 'dxIIlxF3C+x/jo2yMuRADZUHyDdQYPelBgLnxh24ngs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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