SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '556363cce80200d04e8ffb1405a0458a3ee4b9f13b895bfce635b0fd216afb8e' 
  AND token = 'KE0mcX3dToJpgYLwWajKzqxZkTfgGhmrF6ZGNs9uheo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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