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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9fec013eef0d0c15204198f683550c830c7a6a2d90d06dc6eebc0616605bdb2f' 
  AND token = 'B/nSaBFVXvoaOflyxoeQCfAv72n1C/EySCklJNB4UvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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