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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd1b53b921f4b458269c7cae0314defa017e8eed5208efa844f8f1f612871df6b' 
  AND token = 'VQkFRkqT4Rwkl+2O+Q8aMvliWgws1SapZftvQElESw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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