Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5dd9e1624578382976d4dd4cef12ce1771ae21a2934e103ff1f24d79062d709' 
  AND token = 'MKt9oRfBNabtdpKrRfv2leU94Is0owRtjoRcE/z804E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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