Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95bb822509823ef0c8aac9b26109d86da4e08932e2e6fed0376cb91ebd01a7f' 
  AND token = 'N7AnFdtJ9SUW+v1CiyOxqyxsvdjbu8tci+FJueLtEnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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