Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59b9e243b7954ee79c0f30c509375b7aeece31bb4d83345289f4d4a65559f72' 
  AND token = 'scFuq6zVM4PyYTeu69fAG0kt31jycd0bQgwFyvdSMvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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