Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc55f1144232353237cf83b9a19eb9e6f801067c1baa42558d2d03c51e0a6448' 
  AND token = 'BDK3qD+Lm69DFVxEiQoE0ZcRVuRWWGcnGii8cQTkW3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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