Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af64ada68de327808c9f3d0386c2f0da9099caec01b58fa4c4f342539cb43eaa' 
  AND token = 'IrHJRCSIInYldpA+dhdLpgysDpM3nh1RnSYWN30S5hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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