Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d40e4535cd5e16b252c3bc99c3d7d690cccd1cfb890cd3f1d94ef617d50559' 
  AND token = 'YJOmLJrQBd5p4DidH+BJGAMRcWg29wEq7vzGQH1kRhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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