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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4a56232f62ad4f564e207f9c44bbbf489c664844d34f5752c92a569162648c78' 
  AND token = 'hvmRoGBFNl4laZBdOfdHRacLjgsiwnaWOv4REuvpCC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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