Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d3a84a80f20801636715ec5747bd0581e15e4b369e353b4afa8bbd1db7f7c5' 
  AND token = 'SheLx/Qxa67YrzmFEdwBjskV3XIeB7G1/vs4wfT2oZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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