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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd67f79e7e7735cf73771cd53e8b5f8754f230aca3784bb947c432098e7290c50' 
  AND token = 'cxPuYkatyemt4fZ8CK0xhDkaA99wr7AyeEnccWipzDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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