Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51261586660ade48603f76149fb00e03014d29d1e6b27bfccc3deff69bbf64b' 
  AND token = 'HsLWsijhnHZO7XBvlaK6Yk6o3AJZTbVuOOCSV+VVbLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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