Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8d69876f66d46f7e943d1f5baa8cf2e2a84e436755f677f9288bb2cb22c3fe0c' 
  AND token = '3g1FZ837sXHjkvxQScTORrR79Qnpi/tUAXleT3Ljyac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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