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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '44d51a4ebff9e7ac35d47f4b29d5aac614fecc43a74185eea2a4faf33d67f147' 
  AND token = 'IfNAo7o4B82P5LlxEJ07oZY4Rr9JeRsdUzHH9Q7oseE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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