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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '36f595a6881ce474acd37aac16dd227b478e802abeae31b4d5d539f2033a28b8' 
  AND token = 'gmGtRUDQ4EvD/2fsZ8/HO0aKIFHQCePdC94P2L+tF20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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