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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a79f061ffa33d68c0fbaf383e40c4291ea54db473d4dc030358a6088a3e14365' 
  AND token = 'ioC65+DrhAi2LBq9Qb9b4VGFJ17ptMkVz8SKS4otNTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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