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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f171b3ea181415aa304ae067b21e8f49bd866d38a69cad1ad07050db3d191d2f' 
  AND token = 'm9Y3hWWgis907ji4WSTyxpolThT6q46FgkL8JfTlBVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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