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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd7e73ef5e2889b5d10a0bb63dd2a4dd92b414eee35c7005fbfa302e521a7207f' 
  AND token = 'P9flw1uK0yJavuLW3/CcbbStpl7Bd8oO57d1StTXB/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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