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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1abb2e410541ee72c2ad937ca589a1294ea095db4e621521877c9a91016f78e5' 
  AND token = 'iht9dGYl2Zb86ml32M6t0lRnkhGW/R5vZyWT3QySSG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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