Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2fe8d266c9921276a65dc280ce8f38557989783a7c6acd8103e08111f629429e' 
  AND token = 'Fl6CZCGUtKOHbgCeFy4tiWHFLur3LBa+fV47DdVPq8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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