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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '53e52b03803da6b26def22ce00b3de739216d07d8737a8cd532901658de5bf22' 
  AND token = 'Uxdk3INiwazoNqOSjS1LKuW1sLSTCockY+W2hw5Gpoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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