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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '71d220a03f6df62a10cbc83d3b6e43f5735582b31ffa14d2714688db0e5db7a9' 
  AND token = 'N2VnrK2EEY8OpURBERppGychhz2E6Bz3H9KPbRbdoeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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