Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbf8d29ed0b2e921af64e9fa0fc5b29d08d1c70af94c0259444d77fa300d81d' 
  AND token = 'hJZifvcYHyGKRdxMb7bLN1n76Igcc7KCXCXOaV876Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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