SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8aec9b4160888d2f1a3a2c1549aa62e7631ec3a6db0017f905a768ec2b15e8cc' 
  AND token = 'AdXurbhfjswCqcl/jmx+4+BpCU88H4zdr+HcHOR7h+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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