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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6b15f6786b2ceb915ce5f067a6483dfd419e056dc79612f93f1fccf9b29fa235' 
  AND token = 'RF2uZbEb5G9y4UbUJ/rqkcGtgxDP+56oSIS0otJO7HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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