Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37e2e7303fcf13e1e7a6745683707ae43c6171995df1ade2eee36e5cf590702' 
  AND token = '0R4pHOicsOfhhSFOQNIjvMHEAuDqs0Zv2cVw9n1z2yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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