Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c18338b925a03c65aa572d6efd7a0f1b88855df8f83ead945139ac200da8717' 
  AND token = 'd/lwRdkj85Kzo/4Z+VCdiUD9f2G6EoW3OtQbkkFYC8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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