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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'afd000cc1f3f2a7d0c9fcfce77b1a29458c6a4325e0235a620bed2afe1464f44' 
  AND token = 'l7x1e97j1Pxxskmc7yITaClQW+AnDQWAjiWgy+0MAeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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