Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6985fdc58dbc6a6b316577a81a7fa3f1bea48eac01dea44e8f33ad454bab3067' 
  AND token = 'ue5s0F3OVXkm4jOCpnjAOtK7RF6slXfcxBtOcH6dA0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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