Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8b0868b7a1e8522ba98ccfa10be79f355686cc53fd4b01eeb3e2a39c7dc7ee' 
  AND token = 'tCkEztd7ogaitsfSO4u5Q0DFEbtI/Gg4iPJZwx55dQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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