SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a5e13731fba564196780d88c0864a39e26c692eef4b993725b6a64c7e6190601' 
  AND token = 'DgQKIBRFFbUlu7o/CzWSRtaQF9TuGTBFjsJXx7F2wZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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