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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7bcd0c56088b48c066c7c983ff37f08fd7b788c3560c105f9ee67908b61fe187' 
  AND token = 'oHGCgIdAc45VJu6fvd1QXEimXNpDjY9Shuc5MqZF0ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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