Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba75a64d8352667572229fcec30cae8128d22973d09169115f338d9fa44300f3' 
  AND token = 'Sy3jCN8eJznMeh+uZ/fk/869gI8nT1AXNZ6MB6NgyYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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