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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5cce52df5538e7f18c4aed1e942bbf8f4ced8e858b3964439d0c091b3e9042e5' 
  AND token = 'ICgd5wXWAdFr+iOnN9KGzD4/tDYQc0lAvoLZff7BNno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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