SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0cff88e72ccb5d4a6a3b74130329480b24558f1a92b635467c2a39ce9ead36f0' 
  AND token = 'b1Gj4RmPX1BetSyAaLQPYxTDjEEAsK7Vxm7gDZM7XpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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