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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3268811a849651c7f8ab9bcdcb8e82fd798b875fad37d14ea67de9775eb11c5a' 
  AND token = 'SmPdrOfixMGXRW51BjsfPSLOb1si+WD7X8TghUWdYuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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