Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b156402d2c783595152774e9825d24321e460c8480046c19abe3ed91e91a996b' 
  AND token = '8INAcRCC3dcBny8im3Hju8QcconbMBFQGRd6mdx50j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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