Sandbox

SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'fef7596ae412392a6210d44ea608a766e51e57c3ec9cea6bf842fc4b4bc6ee2b' 
  AND token = 'vtk0Ka+wWPBF0o2T4ALZozrVOIvgdwN5qsE46BNRUU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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