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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9991b353ec96aa0bb66b3627715c4319fcdba2f9b8012436e818b4260abf32c2' 
  AND token = 'S54iS5K0AS0LjAPVIHP2C3ghhmlOx8xP2lHQ0h9vANo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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