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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'cf4bb826caff454303a934f9f253e451b794c72a5e3a07446840cb227710e266' 
  AND token = '1pMqcJnNbjUnnH3gU4leAYqEXBzHWI7ABT8O+uJy3zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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