Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26f24f92cfeb03362d2a8c799c429fda641e9d3e0d3ad30357c6ee5054c82b8' 
  AND token = 'pp89lqCSGoT4vVMBo4vI2AUTxJdu2dATPRAAOx8n+nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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