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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e97ee67c484fabdc81139a970e85e380b4a20372eae303a77e0af05a5fc43fc7' 
  AND token = 'fI0p5f86EzyTtDPe0CaiuK/PJ57WVFsLuxkqVxeuTh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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