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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a4c15f4992ed43fa6ee2df8be53da3462898bef67d079cc556a55da0c92d4d13' 
  AND token = 'jtuputFGSPJf3+GIQPRmmGyohQmtc7vaWgl84dpO8h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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