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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '94b91b6cf78a759883188a5ff72e12ef55d5683fbbb52a742cbde0de531c54ab' 
  AND token = 'oMxhnAYn1/2Na0seQ8emQ2RmG738MviJXGW+PaB29KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00243

JSON explain

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