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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2cf111a9f5db252a62430d7bf2c139b50cf14bf889f612a7f1ded7d50efd08e7' 
  AND token = '83ruo2mz5Xcyzoy8XeWFMTKLfD3cx514DY7VCotUz9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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