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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '61841516d8cbc2a0deda6fdf941c7281fda705afb9ba7dd04bcd6f8a97d1d810' 
  AND token = 'MbNlaVakcKA/idhz7Yvnd4pSPi8wpsYkIq5ukX/E6b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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