Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa366b535e4e85a4bcf7500f7fc1dc931e5e15673ebcc6f69536ea3c503b26d3' 
  AND token = 'zC7Mmy7hRTxpaP6xxNeW3R2xgGGwXfc+zaerBNGeIaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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