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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '272bb95a76b1af1f32f6f8d9ce58453752578e2dcaabb0388683d9dac08b7192' 
  AND token = 'MzI2oN8pLRNkt9gVNw2ZEcBBXVw6GB2iIqBsn8EWa4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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