Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5e37bf4f07b33d9ff6c69084d0ea913bbac3be3057e4742a08aa0a6e13c478' 
  AND token = 'tvCGdDZ6ftjf0arNWw5u8BZHrVFaIY+CdXef80iXMGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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