Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d61fe490c193c4517c6c47f9bf8d397fbd4567adae5120369e0b02d5a77c6a' 
  AND token = 'noxbeVS/epFDJ0Lr8DdQkDB4MbdiluSi00hJqC3PDRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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