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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '92cb1b040a1758894595f307a35f26696d0aa0cf5f8c382d68a8213b0914434f' 
  AND token = 'd86AUGD7EJN8gZWw0ooL8qqB+MdbpauBojM7xjiMivE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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