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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '10ff76cb0f70b6bbce45da4e1093979d0c4abe9cc0d7627274d6157c8e3ba88f' 
  AND token = 'aSyRe4NCNhDDfbFA6ItbZ92H5/48yfBC5Qb5Ike0zp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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