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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3a4a3fc3a25973496edec68095751f636cb9292db61a5a2753a4a2c8677af83c' 
  AND token = 'SegjjUV5bijcg5+5SCQc1aNDB6KMcMOnMjKGqK2aWFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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