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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'c9d194e515ac28c92a2b72eeabbfcb1a1c9590dd55dbcc2f898f844049b811a9' 
  AND token = 'M8RZbc4TAb0ggvpQDOlOomcwq9G0G0FwOu/H3eqyVrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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