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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '87b39df9c02f253dceef5e3a8b49938ed700c8eb085a60d91bd317f7e6f3b2e9' 
  AND token = 'j8lySwizCEOQAJg82FAdf6EzBCosgXPJbtm39V02hiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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