SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'be781361aa8b2d70aeb9fd6aca84d1f59524119b9153f0a441d208631e00c791' 
  AND token = 'EKQSGg+sIzDFSL15FN9X5/DPvidwWIHpK4oVQAIL5O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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