Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc07edbdc352a0ba660e5a3f03ac9a03bfb8d69cf9604fbfd368b74ec626ef94' 
  AND token = 'UYK8LHVVgPx4j8nfT4xYkJZlP/dWuuqecqhueXEEUoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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