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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '95a1a394f803705f2881df0fc1ade8718c2dccf13f10f45cea9d650ef07db9ce' 
  AND token = '8Cl2npGArA+gJfx2gjE+EO9xF8OwNKEWmoZwWMcla1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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