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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6325c89c8fa68a6f6ca16d3231785d1f5156cb63062d188c78bd726b6bc6b260' 
  AND token = 'joT44suyk4ere6YvaG0XD15iwf27cK0uY2il2rrUJL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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