Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19785303649749f9cff738e87b9899ad364bad848fbdd5d21aa38244ba8f69cd' 
  AND token = '6pcjWGVrS1uoOabioIR6qhXGhtVe44QnohSnOf2LztI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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