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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '305cfd8e46fa3093fba80908107a2810674c4c16d47747b21b16d87d25d774f6' 
  AND token = 'rO879eoCth7NPXOtUlufkaKJLJWnUZL/v3z+U6kjJ1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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