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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '38699344004d8ea7a16c95e9f8c53b98e0755aac5e771d1129efda39e63aef7d' 
  AND token = 'T1mOdwjQFlUgpU3jomlzxjVYuoUIIH46rv4KvscCfmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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