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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '173527dc8f7b0019c6d646eccd016a2b10aebdc0c65381a9785b15deb6595879' 
  AND token = 'B/yArqbGkTxYQigq5lv7fwPw5tpHRx+1g30HuTIlg3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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