Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8abbc9526cb1b348d3c7cea3701e185e93af7da3ef3edad1f34a145d2786ef' 
  AND token = 'GuK5LQ/UJHet0oTWLu111lkGerNCCK9UnqUG6yim2FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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