Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739088f8bf82ec7a07b94dcdc3a9849e90bec4b6cf638608cee412bd4d12a51a' 
  AND token = '6r+JkKHGWabdGEQTQShea9ikym4G3UQ3jGUScB3Vr2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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