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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd402c22b31240738826d09218f85c701acaa168027445d073d374524b330ad2c' 
  AND token = 'hNM5H8P1hxBw65X3yQiqplPb1OIh735NvAhZ8gDHL+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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