Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51fc4454140942ce4bfd491f63555a3fd09dd783802f02284a476dde7ec062ff' 
  AND token = 'Uqf9xl2Ot7BlRn5pa+TQlv/hDUGpP4hknLrSnB1RSds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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