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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9861731ffc52d8fb5f171fd4472c944161a8bbb081ee35a6445c68c65e698657' 
  AND token = 'k7g2WUz0QYaedn2gv8sOqobes//LtkvBbvCF1I9lZP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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