Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2737fcd58f7b0c1433a3de6a45488a788b5b4c0f5c873c6da20510e206bed76c' 
  AND token = 'vCSHzQAKp+2czC1Xwy4rNUdqidwdRTcuHJ0iwD0f9x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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