Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf8ff1f8d3c7fce9c192b8bb31226c2d5feb42bc37f8676c947ed92314a4ffc' 
  AND token = 'tnfK3lM6+TKe25L8rd+d+fnrMWj2qQYnprK7HANPeDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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