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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9a8b0119bb6b3d1e157791cd5a40c429b05e8228245e96168197f8b7625eefd7' 
  AND token = 'kA4Givh5oa5w1kfw69nDC9DxLKfxK7irFpnLqR/tO/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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