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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '20080ed5de84bbc9b24b18d0278cb10810b174271bc9b06c8d07daedf8e83701' 
  AND token = 'SfmEJw0SteMPOVwsAEb6oXN/mNVZQ09woEUf0aYWZH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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