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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6924fa1e7090d49e2d4740a81e9a9494302765183ab7b6fd7bdb62d32ab1b7ee' 
  AND token = 'rfM2v+CTRDk44ToTLm7dSEatTK8TiwbKkZwYgAbyX0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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