Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e2d9a73dc7fcfe332cea21bc3d381ff56c388c07764a12734e7359dfa89c43' 
  AND token = 'mVldgTLa4A9W0NMUnxjChUynCCyrpxCEM2csvE/ILJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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