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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '508866e41329ce9ccd38a10072352195328ed192aff2a28cfa34b0c67fd5dab8' 
  AND token = 'wHk3630vs2ASRlbuHYxafM0xQP/vTIYfE8w7QfSscyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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