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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4e2d980f03a82a4b6cf3c5fc132ddedb74b3a3a2b10b10023db3d4bc839d497f' 
  AND token = 'WenjKKE5Wfwap2STKs3qmxPQa+Ktc/sjq+ed/xGxDzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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