Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81575f143b7a8ed35a713d356fa1099e05b29138cb795f057670481d14a1da2b' 
  AND token = 'uDBA0H8ZPEMj/tlALjfLmLtO/kqW8ZAJ0X8do23KasA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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