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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b7a797e2abcc83b3950fbbb485648a6784381d27f8a4b3ead1e97c550ab83159' 
  AND token = 'Tp63rbyLCcZ+OgqFWT+VXRj3KMFNxqAUtijcbZDk1r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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