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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a4baf197180fb127a0df236f2a1680bc685ae13b9d977345167e398fdd1e86e6' 
  AND token = 'CCwpW9olv4lDP2hL1yOKMo6ZWX7C5PCddgrOeGiOy1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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