Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '366a3246b59c7904b1a96e03997dddb8a9bc4b062c5cef5b91cfa7a68e4f5e5d' 
  AND token = 'JcvArqOhyWVpj+mFyy+z9SMaY9kd4w9EVECJLgLref4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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