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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '66b82f6c675a4054564bf1fb544177f3a613a351783757924e140b15cc18034a' 
  AND token = '1jxJ0c9o6/dEVSjVu72OoTF6QzCIkSi2umUeTQg1B94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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