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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3a7074b9f5aa9a975644fcba395facfa728501ee15ec3125c58900e2008a132d' 
  AND token = 'kZt89GsIHgOvzfb2rBtLUHs5R8dL1RmNzaEVLJamboI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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