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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6dd8f285e1184f31d583b70c980cb5762da353246d434b1bfc8623f9376c0429' 
  AND token = 'TT9jseuqaaPPcp8ubpJAhyHuNOIPhLh06qFi7v0k9c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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