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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd04751de5ffef254e885813d655d81b8353f5a155759069935f00ba3497c13fb' 
  AND token = '7wPZnzVrFz0r7hHOMCNbmi1m1Bhzxq2zzfi90O+hVY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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